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NetBSD/sys/coda/coda_vnops.c
ad 3029ac48c7 - Use the LWP cached credentials where sane. 
- Minor cosmetic changes.
2006-07-21 16:48:45 +00:00

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/*
coda_create/vn_open
remove/unlink
link
mkdir
rmdir
symlink
*/
/* $NetBSD: coda_vnops.c,v 1.50 2006/07/21 16:48:47 ad Exp $ */
/*
*
* Coda: an Experimental Distributed File System
* Release 3.1
*
* Copyright (c) 1987-1998 Carnegie Mellon University
* All Rights Reserved
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation, and
* that credit is given to Carnegie Mellon University in all documents
* and publicity pertaining to direct or indirect use of this code or its
* derivatives.
*
* CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS,
* SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS
* FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON
* DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER
* RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF
* ANY DERIVATIVE WORK.
*
* Carnegie Mellon encourages users of this software to return any
* improvements or extensions that they make, and to grant Carnegie
* Mellon the rights to redistribute these changes without encumbrance.
*
* @(#) coda/coda_vnops.c,v 1.1.1.1 1998/08/29 21:26:46 rvb Exp $
*/
/*
* Mach Operating System
* Copyright (c) 1990 Carnegie-Mellon University
* Copyright (c) 1989 Carnegie-Mellon University
* All rights reserved. The CMU software License Agreement specifies
* the terms and conditions for use and redistribution.
*/
/*
* This code was written for the Coda file system at Carnegie Mellon
* University. Contributers include David Steere, James Kistler, and
* M. Satyanarayanan.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: coda_vnops.c,v 1.50 2006/07/21 16:48:47 ad Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/errno.h>
#include <sys/acct.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <sys/namei.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/select.h>
#include <sys/user.h>
#include <sys/kauth.h>
#include <miscfs/genfs/genfs.h>
#include <coda/coda.h>
#include <coda/cnode.h>
#include <coda/coda_vnops.h>
#include <coda/coda_venus.h>
#include <coda/coda_opstats.h>
#include <coda/coda_subr.h>
#include <coda/coda_namecache.h>
#include <coda/coda_pioctl.h>
/*
* These flags select various performance enhancements.
*/
int coda_attr_cache = 1; /* Set to cache attributes in the kernel */
int coda_symlink_cache = 1; /* Set to cache symbolic link information */
int coda_access_cache = 1; /* Set to handle some access checks directly */
/* structure to keep track of vfs calls */
struct coda_op_stats coda_vnodeopstats[CODA_VNODEOPS_SIZE];
#define MARK_ENTRY(op) (coda_vnodeopstats[op].entries++)
#define MARK_INT_SAT(op) (coda_vnodeopstats[op].sat_intrn++)
#define MARK_INT_FAIL(op) (coda_vnodeopstats[op].unsat_intrn++)
#define MARK_INT_GEN(op) (coda_vnodeopstats[op].gen_intrn++)
/* What we are delaying for in printf */
int coda_printf_delay = 0; /* in microseconds */
int coda_vnop_print_entry = 0;
static int coda_lockdebug = 0;
/* Definition of the vfs operation vector */
/*
* Some NetBSD details:
*
* coda_start is called at the end of the mount syscall.
* coda_init is called at boot time.
*/
#define ENTRY if(coda_vnop_print_entry) myprintf(("Entered %s\n",__func__))
/* Definition of the vnode operation vector */
const struct vnodeopv_entry_desc coda_vnodeop_entries[] = {
{ &vop_default_desc, coda_vop_error },
{ &vop_lookup_desc, coda_lookup }, /* lookup */
{ &vop_create_desc, coda_create }, /* create */
{ &vop_mknod_desc, coda_vop_error }, /* mknod */
{ &vop_open_desc, coda_open }, /* open */
{ &vop_close_desc, coda_close }, /* close */
{ &vop_access_desc, coda_access }, /* access */
{ &vop_getattr_desc, coda_getattr }, /* getattr */
{ &vop_setattr_desc, coda_setattr }, /* setattr */
{ &vop_read_desc, coda_read }, /* read */
{ &vop_write_desc, coda_write }, /* write */
{ &vop_fcntl_desc, genfs_fcntl }, /* fcntl */
{ &vop_ioctl_desc, coda_ioctl }, /* ioctl */
/* 1.3 { &vop_select_desc, coda_select }, select */
{ &vop_mmap_desc, genfs_mmap }, /* mmap */
{ &vop_fsync_desc, coda_fsync }, /* fsync */
{ &vop_remove_desc, coda_remove }, /* remove */
{ &vop_link_desc, coda_link }, /* link */
{ &vop_rename_desc, coda_rename }, /* rename */
{ &vop_mkdir_desc, coda_mkdir }, /* mkdir */
{ &vop_rmdir_desc, coda_rmdir }, /* rmdir */
{ &vop_symlink_desc, coda_symlink }, /* symlink */
{ &vop_readdir_desc, coda_readdir }, /* readdir */
{ &vop_readlink_desc, coda_readlink }, /* readlink */
{ &vop_abortop_desc, coda_abortop }, /* abortop */
{ &vop_inactive_desc, coda_inactive }, /* inactive */
{ &vop_reclaim_desc, coda_reclaim }, /* reclaim */
{ &vop_lock_desc, coda_lock }, /* lock */
{ &vop_unlock_desc, coda_unlock }, /* unlock */
{ &vop_bmap_desc, coda_bmap }, /* bmap */
{ &vop_strategy_desc, coda_strategy }, /* strategy */
{ &vop_print_desc, coda_vop_error }, /* print */
{ &vop_islocked_desc, coda_islocked }, /* islocked */
{ &vop_pathconf_desc, coda_vop_error }, /* pathconf */
{ &vop_advlock_desc, coda_vop_nop }, /* advlock */
{ &vop_bwrite_desc, coda_vop_error }, /* bwrite */
{ &vop_lease_desc, coda_vop_nop }, /* lease */
{ &vop_seek_desc, genfs_seek }, /* seek */
{ &vop_poll_desc, genfs_poll }, /* poll */
{ &vop_getpages_desc, coda_getpages }, /* getpages */
{ &vop_putpages_desc, coda_putpages }, /* putpages */
{ NULL, NULL }
};
const struct vnodeopv_desc coda_vnodeop_opv_desc =
{ &coda_vnodeop_p, coda_vnodeop_entries };
/* Definitions of NetBSD vnodeop interfaces */
/* A generic panic: we were called with something we didn't define yet */
int
coda_vop_error(void *anon) {
struct vnodeop_desc **desc = (struct vnodeop_desc **)anon;
myprintf(("coda_vop_error: Vnode operation %s called, but not defined.\n",
(*desc)->vdesc_name));
/*
panic("coda_nbsd_vop_error");
return 0;
*/
return EIO;
}
/* A generic do-nothing. For lease_check, advlock */
int
coda_vop_nop(void *anon) {
struct vnodeop_desc **desc = (struct vnodeop_desc **)anon;
if (codadebug) {
myprintf(("Vnode operation %s called, but unsupported\n",
(*desc)->vdesc_name));
}
return (0);
}
int
coda_vnodeopstats_init(void)
{
int i;
for(i=0;i<CODA_VNODEOPS_SIZE;i++) {
coda_vnodeopstats[i].opcode = i;
coda_vnodeopstats[i].entries = 0;
coda_vnodeopstats[i].sat_intrn = 0;
coda_vnodeopstats[i].unsat_intrn = 0;
coda_vnodeopstats[i].gen_intrn = 0;
}
return 0;
}
/*
* coda_open calls Venus to return the device, inode pair of the cache
* file holding the data. Using iget, coda_open finds the vnode of the
* cache file, and then opens it.
*/
int
coda_open(void *v)
{
/*
* NetBSD can pass the O_EXCL flag in mode, even though the check
* has already happened. Venus defensively assumes that if open
* is passed the EXCL, it must be a bug. We strip the flag here.
*/
/* true args */
struct vop_open_args *ap = v;
struct vnode **vpp = &(ap->a_vp);
struct cnode *cp = VTOC(*vpp);
int flag = ap->a_mode & (~O_EXCL);
kauth_cred_t cred = ap->a_cred;
struct lwp *l = ap->a_l;
/* locals */
int error;
struct vnode *vp;
dev_t dev;
ino_t inode;
MARK_ENTRY(CODA_OPEN_STATS);
/* Check for open of control file. */
if (IS_CTL_VP(*vpp)) {
/* XXX */
/* if (WRITABLE(flag)) */
if (flag & (FWRITE | O_TRUNC | O_CREAT | O_EXCL)) {
MARK_INT_FAIL(CODA_OPEN_STATS);
return(EACCES);
}
MARK_INT_SAT(CODA_OPEN_STATS);
return(0);
}
error = venus_open(vtomi((*vpp)), &cp->c_fid, flag, cred, l, &dev, &inode);
if (error)
return (error);
if (!error) {
CODADEBUG( CODA_OPEN,myprintf(("open: dev %d inode %llu result %d\n",
dev, (unsigned long long)inode, error)); )
}
/* Translate the <device, inode> pair for the cache file into
an inode pointer. */
error = coda_grab_vnode(dev, inode, &vp);
if (error)
return (error);
/* We get the vnode back locked in both Mach and NetBSD. Needs unlocked */
VOP_UNLOCK(vp, 0);
/* Keep a reference until the close comes in. */
vref(*vpp);
/* Save the vnode pointer for the cache file. */
if (cp->c_ovp == NULL) {
cp->c_ovp = vp;
} else {
if (cp->c_ovp != vp)
panic("coda_open: cp->c_ovp != ITOV(ip)");
}
cp->c_ocount++;
/* Flush the attribute cached if writing the file. */
if (flag & FWRITE) {
cp->c_owrite++;
cp->c_flags &= ~C_VATTR;
}
/* Save the <device, inode> pair for the cache file to speed
up subsequent page_read's. */
cp->c_device = dev;
cp->c_inode = inode;
/* Open the cache file. */
error = VOP_OPEN(vp, flag, cred, l);
return(error);
}
/*
* Close the cache file used for I/O and notify Venus.
*/
int
coda_close(void *v)
{
/* true args */
struct vop_close_args *ap = v;
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
int flag = ap->a_fflag;
kauth_cred_t cred = ap->a_cred;
struct lwp *l = ap->a_l;
/* locals */
int error;
MARK_ENTRY(CODA_CLOSE_STATS);
/* Check for close of control file. */
if (IS_CTL_VP(vp)) {
MARK_INT_SAT(CODA_CLOSE_STATS);
return(0);
}
if (IS_UNMOUNTING(cp)) {
if (cp->c_ovp) {
#ifdef CODA_VERBOSE
printf("coda_close: destroying container ref %d, ufs vp %p of vp %p/cp %p\n",
vp->v_usecount, cp->c_ovp, vp, cp);
#endif
#ifdef hmm
vgone(cp->c_ovp);
#else
vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY);
VOP_CLOSE(cp->c_ovp, flag, cred, l); /* Do errors matter here? */
vput(cp->c_ovp);
#endif
} else {
#ifdef CODA_VERBOSE
printf("coda_close: NO container vp %p/cp %p\n", vp, cp);
#endif
}
return ENODEV;
} else {
vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY);
VOP_CLOSE(cp->c_ovp, flag, cred, l); /* Do errors matter here? */
vput(cp->c_ovp);
}
if (--cp->c_ocount == 0)
cp->c_ovp = NULL;
if (flag & FWRITE) /* file was opened for write */
--cp->c_owrite;
error = venus_close(vtomi(vp), &cp->c_fid, flag, cred, l);
vrele(CTOV(cp));
CODADEBUG(CODA_CLOSE, myprintf(("close: result %d\n",error)); )
return(error);
}
int
coda_read(void *v)
{
struct vop_read_args *ap = v;
ENTRY;
return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_READ,
ap->a_ioflag, ap->a_cred, curlwp));
}
int
coda_write(void *v)
{
struct vop_write_args *ap = v;
ENTRY;
return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_WRITE,
ap->a_ioflag, ap->a_cred, curlwp));
}
int
coda_rdwr(struct vnode *vp, struct uio *uiop, enum uio_rw rw, int ioflag,
kauth_cred_t cred, struct lwp *l)
{
/* upcall decl */
/* NOTE: container file operation!!! */
/* locals */
struct cnode *cp = VTOC(vp);
struct vnode *cfvp = cp->c_ovp;
struct proc *p = l->l_proc;
int opened_internally = 0;
int error = 0;
MARK_ENTRY(CODA_RDWR_STATS);
CODADEBUG(CODA_RDWR, myprintf(("coda_rdwr(%d, %p, %lu, %lld)\n", rw,
uiop->uio_iov->iov_base,
(unsigned long) uiop->uio_resid,
(long long) uiop->uio_offset)); )
/* Check for rdwr of control object. */
if (IS_CTL_VP(vp)) {
MARK_INT_FAIL(CODA_RDWR_STATS);
return(EINVAL);
}
/* Redirect the request to UFS. */
/*
* If file is not already open this must be a page
* {read,write} request. Iget the cache file's inode
* pointer if we still have its <device, inode> pair.
* Otherwise, we must do an internal open to derive the
* pair.
*/
if (cfvp == NULL) {
/*
* If we're dumping core, do the internal open. Otherwise
* venus won't have the correct size of the core when
* it's completely written.
*/
if (cp->c_inode != 0 && !(p && (p->p_acflag & ACORE))) {
error = coda_grab_vnode(cp->c_device, cp->c_inode, &cfvp);
if (error) {
MARK_INT_FAIL(CODA_RDWR_STATS);
return(error);
}
/*
* We get the vnode back locked in both Mach and
* NetBSD. Needs unlocked
*/
VOP_UNLOCK(cfvp, 0);
}
else {
opened_internally = 1;
MARK_INT_GEN(CODA_OPEN_STATS);
error = VOP_OPEN(vp, (rw == UIO_READ ? FREAD : FWRITE),
cred, l);
#ifdef CODA_VERBOSE
printf("coda_rdwr: Internally Opening %p\n", vp);
#endif
if (error) {
MARK_INT_FAIL(CODA_RDWR_STATS);
return(error);
}
cfvp = cp->c_ovp;
}
}
/* Have UFS handle the call. */
CODADEBUG(CODA_RDWR, myprintf(("indirect rdwr: fid = %s, refcnt = %d\n",
coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount)); )
if (rw == UIO_READ) {
error = VOP_READ(cfvp, uiop, ioflag, cred);
} else {
error = VOP_WRITE(cfvp, uiop, ioflag, cred);
}
if (error)
MARK_INT_FAIL(CODA_RDWR_STATS);
else
MARK_INT_SAT(CODA_RDWR_STATS);
/* Do an internal close if necessary. */
if (opened_internally) {
MARK_INT_GEN(CODA_CLOSE_STATS);
(void)VOP_CLOSE(vp, (rw == UIO_READ ? FREAD : FWRITE), cred, l);
}
/* Invalidate cached attributes if writing. */
if (rw == UIO_WRITE)
cp->c_flags &= ~C_VATTR;
return(error);
}
int
coda_ioctl(void *v)
{
/* true args */
struct vop_ioctl_args *ap = v;
struct vnode *vp = ap->a_vp;
int com = ap->a_command;
caddr_t data = ap->a_data;
int flag = ap->a_fflag;
kauth_cred_t cred = ap->a_cred;
struct lwp *l = ap->a_l;
/* locals */
int error;
struct vnode *tvp;
struct nameidata ndp;
struct PioctlData *iap = (struct PioctlData *)data;
MARK_ENTRY(CODA_IOCTL_STATS);
CODADEBUG(CODA_IOCTL, myprintf(("in coda_ioctl on %s\n", iap->path));)
/* Don't check for operation on a dying object, for ctlvp it
shouldn't matter */
/* Must be control object to succeed. */
if (!IS_CTL_VP(vp)) {
MARK_INT_FAIL(CODA_IOCTL_STATS);
CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: vp != ctlvp"));)
return (EOPNOTSUPP);
}
/* Look up the pathname. */
/* Should we use the name cache here? It would get it from
lookupname sooner or later anyway, right? */
NDINIT(&ndp, LOOKUP, (iap->follow ? FOLLOW : NOFOLLOW), UIO_USERSPACE,
iap->path, l);
error = namei(&ndp);
tvp = ndp.ni_vp;
if (error) {
MARK_INT_FAIL(CODA_IOCTL_STATS);
CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: lookup returns %d\n",
error));)
return(error);
}
/*
* Make sure this is a coda style cnode, but it may be a
* different vfsp
*/
/* XXX: this totally violates the comment about vtagtype in vnode.h */
if (tvp->v_tag != VT_CODA) {
vrele(tvp);
MARK_INT_FAIL(CODA_IOCTL_STATS);
CODADEBUG(CODA_IOCTL,
myprintf(("coda_ioctl error: %s not a coda object\n",
iap->path));)
return(EINVAL);
}
if (iap->vi.in_size > VC_MAXDATASIZE) {
vrele(tvp);
return(EINVAL);
}
error = venus_ioctl(vtomi(tvp), &((VTOC(tvp))->c_fid), com, flag, data, cred, l);
if (error)
MARK_INT_FAIL(CODA_IOCTL_STATS);
else
CODADEBUG(CODA_IOCTL, myprintf(("Ioctl returns %d \n", error)); )
vrele(tvp);
return(error);
}
/*
* To reduce the cost of a user-level venus;we cache attributes in
* the kernel. Each cnode has storage allocated for an attribute. If
* c_vattr is valid, return a reference to it. Otherwise, get the
* attributes from venus and store them in the cnode. There is some
* question if this method is a security leak. But I think that in
* order to make this call, the user must have done a lookup and
* opened the file, and therefore should already have access.
*/
int
coda_getattr(void *v)
{
/* true args */
struct vop_getattr_args *ap = v;
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
struct vattr *vap = ap->a_vap;
kauth_cred_t cred = ap->a_cred;
struct lwp *l = ap->a_l;
/* locals */
int error;
MARK_ENTRY(CODA_GETATTR_STATS);
/* Check for getattr of control object. */
if (IS_CTL_VP(vp)) {
MARK_INT_FAIL(CODA_GETATTR_STATS);
return(ENOENT);
}
/* Check to see if the attributes have already been cached */
if (VALID_VATTR(cp)) {
CODADEBUG(CODA_GETATTR, { myprintf(("attr cache hit: %s\n",
coda_f2s(&cp->c_fid)));});
CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR))
print_vattr(&cp->c_vattr); );
*vap = cp->c_vattr;
MARK_INT_SAT(CODA_GETATTR_STATS);
return(0);
}
error = venus_getattr(vtomi(vp), &cp->c_fid, cred, l, vap);
if (!error) {
CODADEBUG(CODA_GETATTR, myprintf(("getattr miss %s: result %d\n",
coda_f2s(&cp->c_fid), error)); )
CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR))
print_vattr(vap); );
/* If not open for write, store attributes in cnode */
if ((cp->c_owrite == 0) && (coda_attr_cache)) {
cp->c_vattr = *vap;
cp->c_flags |= C_VATTR;
}
}
return(error);
}
int
coda_setattr(void *v)
{
/* true args */
struct vop_setattr_args *ap = v;
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
struct vattr *vap = ap->a_vap;
kauth_cred_t cred = ap->a_cred;
struct lwp *l = ap->a_l;
/* locals */
int error;
MARK_ENTRY(CODA_SETATTR_STATS);
/* Check for setattr of control object. */
if (IS_CTL_VP(vp)) {
MARK_INT_FAIL(CODA_SETATTR_STATS);
return(ENOENT);
}
if (codadebug & CODADBGMSK(CODA_SETATTR)) {
print_vattr(vap);
}
error = venus_setattr(vtomi(vp), &cp->c_fid, vap, cred, l);
if (!error)
cp->c_flags &= ~C_VATTR;
CODADEBUG(CODA_SETATTR, myprintf(("setattr %d\n", error)); )
return(error);
}
int
coda_access(void *v)
{
/* true args */
struct vop_access_args *ap = v;
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
int mode = ap->a_mode;
kauth_cred_t cred = ap->a_cred;
struct lwp *l = ap->a_l;
/* locals */
int error;
MARK_ENTRY(CODA_ACCESS_STATS);
/* Check for access of control object. Only read access is
allowed on it. */
if (IS_CTL_VP(vp)) {
/* bogus hack - all will be marked as successes */
MARK_INT_SAT(CODA_ACCESS_STATS);
return(((mode & VREAD) && !(mode & (VWRITE | VEXEC)))
? 0 : EACCES);
}
/*
* if the file is a directory, and we are checking exec (eg lookup)
* access, and the file is in the namecache, then the user must have
* lookup access to it.
*/
if (coda_access_cache) {
if ((vp->v_type == VDIR) && (mode & VEXEC)) {
if (coda_nc_lookup(cp, ".", 1, cred)) {
MARK_INT_SAT(CODA_ACCESS_STATS);
return(0); /* it was in the cache */
}
}
}
error = venus_access(vtomi(vp), &cp->c_fid, mode, cred, l);
return(error);
}
/*
* CODA abort op, called after namei() when a CREATE/DELETE isn't actually
* done. If a buffer has been saved in anticipation of a coda_create or
* a coda_remove, delete it.
*/
/* ARGSUSED */
int
coda_abortop(void *v)
{
/* true args */
struct vop_abortop_args /* {
struct vnode *a_dvp;
struct componentname *a_cnp;
} */ *ap = v;
/* upcall decl */
/* locals */
if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF)
PNBUF_PUT(ap->a_cnp->cn_pnbuf);
return (0);
}
int
coda_readlink(void *v)
{
/* true args */
struct vop_readlink_args *ap = v;
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
struct uio *uiop = ap->a_uio;
kauth_cred_t cred = ap->a_cred;
/* locals */
struct lwp *l = curlwp;
int error;
char *str;
int len;
MARK_ENTRY(CODA_READLINK_STATS);
/* Check for readlink of control object. */
if (IS_CTL_VP(vp)) {
MARK_INT_FAIL(CODA_READLINK_STATS);
return(ENOENT);
}
if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { /* symlink was cached */
uiop->uio_rw = UIO_READ;
error = uiomove(cp->c_symlink, (int)cp->c_symlen, uiop);
if (error)
MARK_INT_FAIL(CODA_READLINK_STATS);
else
MARK_INT_SAT(CODA_READLINK_STATS);
return(error);
}
error = venus_readlink(vtomi(vp), &cp->c_fid, cred, l, &str, &len);
if (!error) {
uiop->uio_rw = UIO_READ;
error = uiomove(str, len, uiop);
if (coda_symlink_cache) {
cp->c_symlink = str;
cp->c_symlen = len;
cp->c_flags |= C_SYMLINK;
} else
CODA_FREE(str, len);
}
CODADEBUG(CODA_READLINK, myprintf(("in readlink result %d\n",error));)
return(error);
}
int
coda_fsync(void *v)
{
/* true args */
struct vop_fsync_args *ap = v;
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
kauth_cred_t cred = ap->a_cred;
struct lwp *l = ap->a_l;
/* locals */
struct vnode *convp = cp->c_ovp;
int error;
MARK_ENTRY(CODA_FSYNC_STATS);
/* Check for fsync on an unmounting object */
/* The NetBSD kernel, in it's infinite wisdom, can try to fsync
* after an unmount has been initiated. This is a Bad Thing,
* which we have to avoid. Not a legitimate failure for stats.
*/
if (IS_UNMOUNTING(cp)) {
return(ENODEV);
}
/* Check for fsync of control object. */
if (IS_CTL_VP(vp)) {
MARK_INT_SAT(CODA_FSYNC_STATS);
return(0);
}
if (convp)
VOP_FSYNC(convp, cred, MNT_WAIT, 0, 0, l);
/*
* We can expect fsync on any vnode at all if venus is pruging it.
* Venus can't very well answer the fsync request, now can it?
* Hopefully, it won't have to, because hopefully, venus preserves
* the (possibly untrue) invariant that it never purges an open
* vnode. Hopefully.
*/
if (cp->c_flags & C_PURGING) {
return(0);
}
error = venus_fsync(vtomi(vp), &cp->c_fid, cred, l);
CODADEBUG(CODA_FSYNC, myprintf(("in fsync result %d\n",error)); );
return(error);
}
int
coda_inactive(void *v)
{
/* XXX - at the moment, inactive doesn't look at cred, and doesn't
have a proc pointer. Oops. */
/* true args */
struct vop_inactive_args *ap = v;
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
kauth_cred_t cred __attribute__((unused)) = NULL;
struct lwp *l __attribute__((unused)) = curlwp;
/* upcall decl */
/* locals */
/* We don't need to send inactive to venus - DCS */
MARK_ENTRY(CODA_INACTIVE_STATS);
if (IS_CTL_VP(vp)) {
MARK_INT_SAT(CODA_INACTIVE_STATS);
return 0;
}
CODADEBUG(CODA_INACTIVE, myprintf(("in inactive, %s, vfsp %p\n",
coda_f2s(&cp->c_fid), vp->v_mount));)
/* If an array has been allocated to hold the symlink, deallocate it */
if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) {
if (cp->c_symlink == NULL)
panic("coda_inactive: null symlink pointer in cnode");
CODA_FREE(cp->c_symlink, cp->c_symlen);
cp->c_flags &= ~C_SYMLINK;
cp->c_symlen = 0;
}
/* Remove it from the table so it can't be found. */
coda_unsave(cp);
if (vp->v_mount->mnt_data == NULL) {
myprintf(("Help! vfsp->vfs_data was NULL, but vnode %p wasn't dying\n", vp));
panic("badness in coda_inactive");
}
if (IS_UNMOUNTING(cp)) {
#ifdef DEBUG
printf("coda_inactive: IS_UNMOUNTING use %d: vp %p, cp %p\n", vp->v_usecount, vp, cp);
if (cp->c_ovp != NULL)
printf("coda_inactive: cp->ovp != NULL use %d: vp %p, cp %p\n",
vp->v_usecount, vp, cp);
#endif
lockmgr(&vp->v_lock, LK_RELEASE, &vp->v_interlock);
} else {
#ifdef OLD_DIAGNOSTIC
if (CTOV(cp)->v_usecount) {
panic("coda_inactive: nonzero reference count");
}
if (cp->c_ovp != NULL) {
panic("coda_inactive: cp->ovp != NULL");
}
#endif
VOP_UNLOCK(vp, 0);
vgone(vp);
}
MARK_INT_SAT(CODA_INACTIVE_STATS);
return(0);
}
/*
* Remote file system operations having to do with directory manipulation.
*/
/*
* It appears that in NetBSD, lookup is supposed to return the vnode locked
*/
int
coda_lookup(void *v)
{
/* true args */
struct vop_lookup_args *ap = v;
struct vnode *dvp = ap->a_dvp;
struct cnode *dcp = VTOC(dvp);
struct vnode **vpp = ap->a_vpp;
/*
* It looks as though ap->a_cnp->ni_cnd->cn_nameptr holds the rest
* of the string to xlate, and that we must try to get at least
* ap->a_cnp->ni_cnd->cn_namelen of those characters to macth. I
* could be wrong.
*/
struct componentname *cnp = ap->a_cnp;
kauth_cred_t cred = cnp->cn_cred;
struct lwp *l = cnp->cn_lwp;
/* locals */
struct cnode *cp;
const char *nm = cnp->cn_nameptr;
int len = cnp->cn_namelen;
CodaFid VFid;
int vtype;
int error = 0;
cnp->cn_flags &= ~PDIRUNLOCK;
MARK_ENTRY(CODA_LOOKUP_STATS);
CODADEBUG(CODA_LOOKUP, myprintf(("lookup: %s in %s\n",
nm, coda_f2s(&dcp->c_fid))););
/* Check for lookup of control object. */
if (IS_CTL_NAME(dvp, nm, len)) {
*vpp = coda_ctlvp;
vref(*vpp);
MARK_INT_SAT(CODA_LOOKUP_STATS);
goto exit;
}
if (len+1 > CODA_MAXNAMLEN) {
MARK_INT_FAIL(CODA_LOOKUP_STATS);
CODADEBUG(CODA_LOOKUP, myprintf(("name too long: lookup, %s (%s)\n",
coda_f2s(&dcp->c_fid), nm)););
*vpp = (struct vnode *)0;
error = EINVAL;
goto exit;
}
/* First try to look the file up in the cfs name cache */
/* lock the parent vnode? */
cp = coda_nc_lookup(dcp, nm, len, cred);
if (cp) {
*vpp = CTOV(cp);
vref(*vpp);
CODADEBUG(CODA_LOOKUP,
myprintf(("lookup result %d vpp %p\n",error,*vpp));)
} else {
/* The name wasn't cached, so we need to contact Venus */
error = venus_lookup(vtomi(dvp), &dcp->c_fid, nm, len, cred, l, &VFid, &vtype);
if (error) {
MARK_INT_FAIL(CODA_LOOKUP_STATS);
CODADEBUG(CODA_LOOKUP, myprintf(("lookup error on %s (%s)%d\n",
coda_f2s(&dcp->c_fid), nm, error));)
*vpp = (struct vnode *)0;
} else {
MARK_INT_SAT(CODA_LOOKUP_STATS);
CODADEBUG(CODA_LOOKUP,
myprintf(("lookup: %s type %o result %d\n",
coda_f2s(&VFid), vtype, error)); )
cp = make_coda_node(&VFid, dvp->v_mount, vtype);
*vpp = CTOV(cp);
/* enter the new vnode in the Name Cache only if the top bit isn't set */
/* And don't enter a new vnode for an invalid one! */
if (!(vtype & CODA_NOCACHE))
coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp));
}
}
exit:
/*
* If we are creating, and this was the last name to be looked up,
* and the error was ENOENT, then there really shouldn't be an
* error and we can make the leaf NULL and return success. Since
* this is supposed to work under Mach as well as NetBSD, we're
* leaving this fn wrapped. We also must tell lookup/namei that
* we need to save the last component of the name. (Create will
* have to free the name buffer later...lucky us...)
*/
if (((cnp->cn_nameiop == CREATE) || (cnp->cn_nameiop == RENAME))
&& (cnp->cn_flags & ISLASTCN)
&& (error == ENOENT))
{
error = EJUSTRETURN;
cnp->cn_flags |= SAVENAME;
*ap->a_vpp = NULL;
}
/*
* If we are removing, and we are at the last element, and we
* found it, then we need to keep the name around so that the
* removal will go ahead as planned. Unfortunately, this will
* probably also lock the to-be-removed vnode, which may or may
* not be a good idea. I'll have to look at the bits of
* coda_remove to make sure. We'll only save the name if we did in
* fact find the name, otherwise coda_remove won't have a chance
* to free the pathname.
*/
if ((cnp->cn_nameiop == DELETE)
&& (cnp->cn_flags & ISLASTCN)
&& !error)
{
cnp->cn_flags |= SAVENAME;
}
/*
* If the lookup went well, we need to (potentially?) unlock the
* parent, and lock the child. We are only responsible for
* checking to see if the parent is supposed to be unlocked before
* we return. We must always lock the child (provided there is
* one, and (the parent isn't locked or it isn't the same as the
* parent.) Simple, huh? We can never leave the parent locked unless
* we are ISLASTCN
*/
if (!error || (error == EJUSTRETURN)) {
/* XXX ISDOTDOT changes locking rules - not handled. */
if (!(cnp->cn_flags & LOCKPARENT) || !(cnp->cn_flags & ISLASTCN)) {
/*
* XXX Lock child before unlocking parent?
* XXX Why is it ok to fail to unlock, but a panic to fail to lock?
*/
if ((error = VOP_UNLOCK(dvp, 0))) {
return error;
}
cnp->cn_flags |= PDIRUNLOCK;
/*
* The parent is unlocked. As long as there is a child,
* lock it without bothering to check anything else.
*/
if (*ap->a_vpp) {
if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE|LK_RETRY))) {
panic("unlocked parent but couldn't lock child");
}
}
} else {
/* The parent is locked, and may be the same as the child */
if (*ap->a_vpp && (*ap->a_vpp != dvp)) {
/* Different, go ahead and lock it. */
if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE|LK_RETRY))) {
panic("kept parent locked but couldn't lock child");
}
}
}
} else {
/* If the lookup failed, we need to ensure that the leaf is NULL */
/* Don't change any locking? */
*ap->a_vpp = NULL;
}
return(error);
}
/*ARGSUSED*/
int
coda_create(void *v)
{
/* true args */
struct vop_create_args *ap = v;
struct vnode *dvp = ap->a_dvp;
struct cnode *dcp = VTOC(dvp);
struct vattr *va = ap->a_vap;
int exclusive = 1;
int mode = ap->a_vap->va_mode;
struct vnode **vpp = ap->a_vpp;
struct componentname *cnp = ap->a_cnp;
kauth_cred_t cred = cnp->cn_cred;
struct lwp *l = cnp->cn_lwp;
/* locals */
int error;
struct cnode *cp;
const char *nm = cnp->cn_nameptr;
int len = cnp->cn_namelen;
CodaFid VFid;
struct vattr attr;
MARK_ENTRY(CODA_CREATE_STATS);
/* All creates are exclusive XXX */
/* I'm assuming the 'mode' argument is the file mode bits XXX */
/* Check for create of control object. */
if (IS_CTL_NAME(dvp, nm, len)) {
*vpp = (struct vnode *)0;
MARK_INT_FAIL(CODA_CREATE_STATS);
return(EACCES);
}
error = venus_create(vtomi(dvp), &dcp->c_fid, nm, len, exclusive, mode, va, cred, l, &VFid, &attr);
if (!error) {
/* If this is an exclusive create, panic if the file already exists. */
/* Venus should have detected the file and reported EEXIST. */
if ((exclusive == 1) &&
(coda_find(&VFid) != NULL))
panic("cnode existed for newly created file!");
cp = make_coda_node(&VFid, dvp->v_mount, attr.va_type);
*vpp = CTOV(cp);
/* Update va to reflect the new attributes. */
(*va) = attr;
/* Update the attribute cache and mark it as valid */
if (coda_attr_cache) {
VTOC(*vpp)->c_vattr = attr;
VTOC(*vpp)->c_flags |= C_VATTR;
}
/* Invalidate the parent's attr cache, the modification time has changed */
VTOC(dvp)->c_flags &= ~C_VATTR;
/* enter the new vnode in the Name Cache */
coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp));
CODADEBUG(CODA_CREATE,
myprintf(("create: %s, result %d\n",
coda_f2s(&VFid), error)); )
} else {
*vpp = (struct vnode *)0;
CODADEBUG(CODA_CREATE, myprintf(("create error %d\n", error));)
}
/* Locking strategy. */
/*
* In NetBSD, all creates must explicitly vput their dvp's. We'll
* go ahead and use the LOCKLEAF flag of the cnp argument.
* However, I'm pretty sure that create must return the leaf
* locked; so there is a DIAGNOSTIC check to ensure that this is
* true.
*/
vput(dvp);
if (!error) {
if (cnp->cn_flags & LOCKLEAF) {
if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) {
printf("coda_create: ");
panic("unlocked parent but couldn't lock child");
}
}
#ifdef OLD_DIAGNOSTIC
else {
printf("coda_create: LOCKLEAF not set!\n");
}
#endif
}
/* Have to free the previously saved name */
/*
* This condition is stolen from ufs_makeinode. I have no idea
* why it's here, but what the hey...
*/
if ((cnp->cn_flags & SAVESTART) == 0) {
PNBUF_PUT(cnp->cn_pnbuf);
}
return(error);
}
int
coda_remove(void *v)
{
/* true args */
struct vop_remove_args *ap = v;
struct vnode *dvp = ap->a_dvp;
struct cnode *cp = VTOC(dvp);
struct componentname *cnp = ap->a_cnp;
kauth_cred_t cred = cnp->cn_cred;
struct lwp *l = cnp->cn_lwp;
/* locals */
int error;
const char *nm = cnp->cn_nameptr;
int len = cnp->cn_namelen;
struct cnode *tp;
MARK_ENTRY(CODA_REMOVE_STATS);
CODADEBUG(CODA_REMOVE, myprintf(("remove: %s in %s\n",
nm, coda_f2s(&cp->c_fid))););
/* Remove the file's entry from the CODA Name Cache */
/* We're being conservative here, it might be that this person
* doesn't really have sufficient access to delete the file
* but we feel zapping the entry won't really hurt anyone -- dcs
*/
/* I'm gonna go out on a limb here. If a file and a hardlink to it
* exist, and one is removed, the link count on the other will be
* off by 1. We could either invalidate the attrs if cached, or
* fix them. I'll try to fix them. DCS 11/8/94
*/
tp = coda_nc_lookup(VTOC(dvp), nm, len, cred);
if (tp) {
if (VALID_VATTR(tp)) { /* If attrs are cached */
if (tp->c_vattr.va_nlink > 1) { /* If it's a hard link */
tp->c_vattr.va_nlink--;
}
}
coda_nc_zapfile(VTOC(dvp), nm, len);
/* No need to flush it if it doesn't exist! */
}
/* Invalidate the parent's attr cache, the modification time has changed */
VTOC(dvp)->c_flags &= ~C_VATTR;
/* Check for remove of control object. */
if (IS_CTL_NAME(dvp, nm, len)) {
MARK_INT_FAIL(CODA_REMOVE_STATS);
return(ENOENT);
}
error = venus_remove(vtomi(dvp), &cp->c_fid, nm, len, cred, l);
CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n",error)); )
/*
* Regardless of what happens, we have to unconditionally drop
* locks/refs on parent and child. (I hope). This is based on
* what ufs_remove seems to be doing.
*/
if (dvp == ap->a_vp) {
vrele(ap->a_vp);
} else {
vput(ap->a_vp);
}
vput(dvp);
if ((cnp->cn_flags & SAVESTART) == 0) {
PNBUF_PUT(cnp->cn_pnbuf);
}
return(error);
}
int
coda_link(void *v)
{
/* true args */
struct vop_link_args *ap = v;
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
struct vnode *tdvp = ap->a_dvp;
struct cnode *tdcp = VTOC(tdvp);
struct componentname *cnp = ap->a_cnp;
kauth_cred_t cred = cnp->cn_cred;
struct lwp *l = cnp->cn_lwp;
/* locals */
int error;
const char *nm = cnp->cn_nameptr;
int len = cnp->cn_namelen;
MARK_ENTRY(CODA_LINK_STATS);
if (codadebug & CODADBGMSK(CODA_LINK)) {
myprintf(("nb_link: vp fid: %s\n",
coda_f2s(&cp->c_fid)));
myprintf(("nb_link: tdvp fid: %s)\n",
coda_f2s(&tdcp->c_fid)));
}
if (codadebug & CODADBGMSK(CODA_LINK)) {
myprintf(("link: vp fid: %s\n",
coda_f2s(&cp->c_fid)));
myprintf(("link: tdvp fid: %s\n",
coda_f2s(&tdcp->c_fid)));
}
/* Check for link to/from control object. */
if (IS_CTL_NAME(tdvp, nm, len) || IS_CTL_VP(vp)) {
MARK_INT_FAIL(CODA_LINK_STATS);
return(EACCES);
}
/*
* According to the ufs_link operation here's the locking situation:
* We enter with the thing called "dvp" (the directory) locked.
* We must unconditionally drop locks on "dvp"
*
* We enter with the thing called "vp" (the linked-to) unlocked,
* but ref'd (?)
* We seem to need to lock it before calling coda_link, and
* unconditionally unlock it after.
*/
if ((ap->a_vp != tdvp) && (error = vn_lock(ap->a_vp, LK_EXCLUSIVE))) {
goto exit;
}
error = venus_link(vtomi(vp), &cp->c_fid, &tdcp->c_fid, nm, len, cred, l);
/* Invalidate the parent's attr cache, the modification time has changed */
VTOC(tdvp)->c_flags &= ~C_VATTR;
VTOC(vp)->c_flags &= ~C_VATTR;
CODADEBUG(CODA_LINK, myprintf(("in link result %d\n",error)); )
exit:
if (ap->a_vp != tdvp) {
VOP_UNLOCK(ap->a_vp, 0);
}
vput(tdvp);
/* Drop the name buffer if we don't need to SAVESTART */
if ((cnp->cn_flags & SAVESTART) == 0) {
PNBUF_PUT(cnp->cn_pnbuf);
}
return(error);
}
int
coda_rename(void *v)
{
/* true args */
struct vop_rename_args *ap = v;
struct vnode *odvp = ap->a_fdvp;
struct cnode *odcp = VTOC(odvp);
struct componentname *fcnp = ap->a_fcnp;
struct vnode *ndvp = ap->a_tdvp;
struct cnode *ndcp = VTOC(ndvp);
struct componentname *tcnp = ap->a_tcnp;
kauth_cred_t cred = fcnp->cn_cred;
struct lwp *l = fcnp->cn_lwp;
/* true args */
int error;
const char *fnm = fcnp->cn_nameptr;
int flen = fcnp->cn_namelen;
const char *tnm = tcnp->cn_nameptr;
int tlen = tcnp->cn_namelen;
MARK_ENTRY(CODA_RENAME_STATS);
/* Hmmm. The vnodes are already looked up. Perhaps they are locked?
This could be Bad. XXX */
#ifdef OLD_DIAGNOSTIC
if ((fcnp->cn_cred != tcnp->cn_cred)
|| (fcnp->cn_lwp != tcnp->cn_lwp))
{
panic("coda_rename: component names don't agree");
}
#endif
/* Check for rename involving control object. */
if (IS_CTL_NAME(odvp, fnm, flen) || IS_CTL_NAME(ndvp, tnm, tlen)) {
MARK_INT_FAIL(CODA_RENAME_STATS);
return(EACCES);
}
/* Problem with moving directories -- need to flush entry for .. */
if (odvp != ndvp) {
struct cnode *ovcp = coda_nc_lookup(VTOC(odvp), fnm, flen, cred);
if (ovcp) {
struct vnode *ovp = CTOV(ovcp);
if ((ovp) &&
(ovp->v_type == VDIR)) /* If it's a directory */
coda_nc_zapfile(VTOC(ovp),"..", 2);
}
}
/* Remove the entries for both source and target files */
coda_nc_zapfile(VTOC(odvp), fnm, flen);
coda_nc_zapfile(VTOC(ndvp), tnm, tlen);
/* Invalidate the parent's attr cache, the modification time has changed */
VTOC(odvp)->c_flags &= ~C_VATTR;
VTOC(ndvp)->c_flags &= ~C_VATTR;
if (flen+1 > CODA_MAXNAMLEN) {
MARK_INT_FAIL(CODA_RENAME_STATS);
error = EINVAL;
goto exit;
}
if (tlen+1 > CODA_MAXNAMLEN) {
MARK_INT_FAIL(CODA_RENAME_STATS);
error = EINVAL;
goto exit;
}
error = venus_rename(vtomi(odvp), &odcp->c_fid, &ndcp->c_fid, fnm, flen, tnm, tlen, cred, l);
exit:
CODADEBUG(CODA_RENAME, myprintf(("in rename result %d\n",error));)
/* XXX - do we need to call cache pureg on the moved vnode? */
cache_purge(ap->a_fvp);
/* It seems to be incumbent on us to drop locks on all four vnodes */
/* From-vnodes are not locked, only ref'd. To-vnodes are locked. */
vrele(ap->a_fvp);
vrele(odvp);
if (ap->a_tvp) {
if (ap->a_tvp == ndvp) {
vrele(ap->a_tvp);
} else {
vput(ap->a_tvp);
}
}
vput(ndvp);
return(error);
}
int
coda_mkdir(void *v)
{
/* true args */
struct vop_mkdir_args *ap = v;
struct vnode *dvp = ap->a_dvp;
struct cnode *dcp = VTOC(dvp);
struct componentname *cnp = ap->a_cnp;
struct vattr *va = ap->a_vap;
struct vnode **vpp = ap->a_vpp;
kauth_cred_t cred = cnp->cn_cred;
struct lwp *l = cnp->cn_lwp;
/* locals */
int error;
const char *nm = cnp->cn_nameptr;
int len = cnp->cn_namelen;
struct cnode *cp;
CodaFid VFid;
struct vattr ova;
MARK_ENTRY(CODA_MKDIR_STATS);
/* Check for mkdir of target object. */
if (IS_CTL_NAME(dvp, nm, len)) {
*vpp = (struct vnode *)0;
MARK_INT_FAIL(CODA_MKDIR_STATS);
return(EACCES);
}
if (len+1 > CODA_MAXNAMLEN) {
*vpp = (struct vnode *)0;
MARK_INT_FAIL(CODA_MKDIR_STATS);
return(EACCES);
}
error = venus_mkdir(vtomi(dvp), &dcp->c_fid, nm, len, va, cred, l, &VFid, &ova);
if (!error) {
if (coda_find(&VFid) != NULL)
panic("cnode existed for newly created directory!");
cp = make_coda_node(&VFid, dvp->v_mount, va->va_type);
*vpp = CTOV(cp);
/* enter the new vnode in the Name Cache */
coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp));
/* as a side effect, enter "." and ".." for the directory */
coda_nc_enter(VTOC(*vpp), ".", 1, cred, VTOC(*vpp));
coda_nc_enter(VTOC(*vpp), "..", 2, cred, VTOC(dvp));
if (coda_attr_cache) {
VTOC(*vpp)->c_vattr = ova; /* update the attr cache */
VTOC(*vpp)->c_flags |= C_VATTR; /* Valid attributes in cnode */
}
/* Invalidate the parent's attr cache, the modification time has changed */
VTOC(dvp)->c_flags &= ~C_VATTR;
CODADEBUG( CODA_MKDIR, myprintf(("mkdir: %s result %d\n",
coda_f2s(&VFid), error)); )
} else {
*vpp = (struct vnode *)0;
CODADEBUG(CODA_MKDIR, myprintf(("mkdir error %d\n",error));)
}
/*
* Currently, all mkdirs explicitly vput their dvp's.
* It also appears that we *must* lock the vpp, since
* lockleaf isn't set, but someone down the road is going
* to try to unlock the new directory.
*/
vput(dvp);
if (!error) {
if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) {
panic("coda_mkdir: couldn't lock child");
}
}
/* Have to free the previously saved name */
/*
* ufs_mkdir doesn't check for SAVESTART before freeing the
* pathname buffer, but ufs_create does. For the moment, I'll
* follow their lead, but this seems like it is probably
* incorrect.
*/
PNBUF_PUT(cnp->cn_pnbuf);
return(error);
}
int
coda_rmdir(void *v)
{
/* true args */
struct vop_rmdir_args *ap = v;
struct vnode *dvp = ap->a_dvp;
struct cnode *dcp = VTOC(dvp);
struct componentname *cnp = ap->a_cnp;
kauth_cred_t cred = cnp->cn_cred;
struct lwp *l = cnp->cn_lwp;
/* true args */
int error;
const char *nm = cnp->cn_nameptr;
int len = cnp->cn_namelen;
struct cnode *cp;
MARK_ENTRY(CODA_RMDIR_STATS);
/* Check for rmdir of control object. */
if (IS_CTL_NAME(dvp, nm, len)) {
MARK_INT_FAIL(CODA_RMDIR_STATS);
return(ENOENT);
}
/* We're being conservative here, it might be that this person
* doesn't really have sufficient access to delete the file
* but we feel zapping the entry won't really hurt anyone -- dcs
*/
/*
* As a side effect of the rmdir, remove any entries for children of
* the directory, especially "." and "..".
*/
cp = coda_nc_lookup(dcp, nm, len, cred);
if (cp) coda_nc_zapParentfid(&(cp->c_fid), NOT_DOWNCALL);
/* Remove the file's entry from the CODA Name Cache */
coda_nc_zapfile(dcp, nm, len);
/* Invalidate the parent's attr cache, the modification time has changed */
dcp->c_flags &= ~C_VATTR;
error = venus_rmdir(vtomi(dvp), &dcp->c_fid, nm, len, cred, l);
CODADEBUG(CODA_RMDIR, myprintf(("in rmdir result %d\n", error)); )
/*
* regardless of what happens, we need to drop locks/refs on the
* parent and child. I think.
*/
if (dvp == ap->a_vp) {
vrele(ap->a_vp);
} else {
vput(ap->a_vp);
}
vput(dvp);
if ((cnp->cn_flags & SAVESTART) == 0) {
PNBUF_PUT(cnp->cn_pnbuf);
}
return(error);
}
int
coda_symlink(void *v)
{
/* true args */
struct vop_symlink_args *ap = v;
struct vnode *tdvp = ap->a_dvp;
struct cnode *tdcp = VTOC(tdvp);
struct componentname *cnp = ap->a_cnp;
struct vattr *tva = ap->a_vap;
char *path = ap->a_target;
kauth_cred_t cred = cnp->cn_cred;
struct lwp *l = cnp->cn_lwp;
/* locals */
int error;
u_long saved_cn_flags;
/*
* XXX I'm assuming the following things about coda_symlink's
* arguments:
* t(foo) is the new name/parent/etc being created.
* lname is the contents of the new symlink.
*/
const char *nm = cnp->cn_nameptr;
int len = cnp->cn_namelen;
int plen = strlen(path);
/* XXX What about the vpp argument? Do we need it? */
/*
* Here's the strategy for the moment: perform the symlink, then
* do a lookup to grab the resulting vnode. I know this requires
* two communications with Venus for a new sybolic link, but
* that's the way the ball bounces. I don't yet want to change
* the way the Mach symlink works. When Mach support is
* deprecated, we should change symlink so that the common case
* returns the resultant vnode in a vpp argument.
*/
MARK_ENTRY(CODA_SYMLINK_STATS);
/* Check for symlink of control object. */
if (IS_CTL_NAME(tdvp, nm, len)) {
MARK_INT_FAIL(CODA_SYMLINK_STATS);
return(EACCES);
}
if (plen+1 > CODA_MAXPATHLEN) {
MARK_INT_FAIL(CODA_SYMLINK_STATS);
return(EINVAL);
}
if (len+1 > CODA_MAXNAMLEN) {
MARK_INT_FAIL(CODA_SYMLINK_STATS);
error = EINVAL;
goto exit;
}
error = venus_symlink(vtomi(tdvp), &tdcp->c_fid, path, plen, nm, len, tva, cred, l);
/* Invalidate the parent's attr cache, the modification time has changed */
tdcp->c_flags &= ~C_VATTR;
if (!error) {
/*
* VOP_SYMLINK is not defined to pay attention to cnp->cn_flags;
* these are defined only for VOP_LOOKUP. We desire to reuse
* cnp for a VOP_LOOKUP operation, and must be sure to not pass
* stray flags passed to us. Such stray flags can occur because
* sys_symlink makes a namei call and then reuses the
* componentname structure.
*/
/*
* XXX Arguably we should create our own componentname structure
* and not reuse the one that was passed in.
*/
saved_cn_flags = cnp->cn_flags;
cnp->cn_flags &= ~(MODMASK | OPMASK);
cnp->cn_flags |= LOOKUP;
error = VOP_LOOKUP(tdvp, ap->a_vpp, cnp);
cnp->cn_flags = saved_cn_flags;
/* Either an error occurs, or ap->a_vpp is locked. */
} else {
/* error, so unlock and deference parent */
vput(tdvp);
}
exit:
CODADEBUG(CODA_SYMLINK, myprintf(("in symlink result %d\n",error)); )
return(error);
}
/*
* Read directory entries.
*/
int
coda_readdir(void *v)
{
/* true args */
struct vop_readdir_args *ap = v;
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
struct uio *uiop = ap->a_uio;
kauth_cred_t cred = ap->a_cred;
int *eofflag = ap->a_eofflag;
off_t **cookies = ap->a_cookies;
int *ncookies = ap->a_ncookies;
/* upcall decl */
/* locals */
struct lwp *l = curlwp;
int error = 0;
MARK_ENTRY(CODA_READDIR_STATS);
CODADEBUG(CODA_READDIR, myprintf(("coda_readdir(%p, %lu, %lld)\n", uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, (long long) uiop->uio_offset)); )
/* Check for readdir of control object. */
if (IS_CTL_VP(vp)) {
MARK_INT_FAIL(CODA_READDIR_STATS);
return(ENOENT);
}
{
/* Redirect the request to UFS. */
/* If directory is not already open do an "internal open" on it. */
int opened_internally = 0;
if (cp->c_ovp == NULL) {
opened_internally = 1;
MARK_INT_GEN(CODA_OPEN_STATS);
error = VOP_OPEN(vp, FREAD, cred, l);
#ifdef CODA_VERBOSE
printf("coda_readdir: Internally Opening %p\n", vp);
#endif
if (error) return(error);
} else
vp = cp->c_ovp;
/* Have UFS handle the call. */
CODADEBUG(CODA_READDIR, myprintf((
"indirect readdir: fid = %s, refcnt = %d\n",
coda_f2s(&cp->c_fid), vp->v_usecount)); )
error = VOP_READDIR(vp, uiop, cred, eofflag, cookies, ncookies);
if (error)
MARK_INT_FAIL(CODA_READDIR_STATS);
else
MARK_INT_SAT(CODA_READDIR_STATS);
/* Do an "internal close" if necessary. */
if (opened_internally) {
MARK_INT_GEN(CODA_CLOSE_STATS);
(void)VOP_CLOSE(vp, FREAD, cred, l);
}
}
return(error);
}
/*
* Convert from file system blocks to device blocks
*/
int
coda_bmap(void *v)
{
/* XXX on the global proc */
/* true args */
struct vop_bmap_args *ap = v;
struct vnode *vp __attribute__((unused)) = ap->a_vp; /* file's vnode */
daddr_t bn __attribute__((unused)) = ap->a_bn; /* fs block number */
struct vnode **vpp = ap->a_vpp; /* RETURN vp of device */
daddr_t *bnp __attribute__((unused)) = ap->a_bnp; /* RETURN device block number */
struct lwp *l __attribute__((unused)) = curlwp;
/* upcall decl */
/* locals */
*vpp = (struct vnode *)0;
myprintf(("coda_bmap called!\n"));
return(EINVAL);
}
/*
* I don't think the following two things are used anywhere, so I've
* commented them out
*
* struct buf *async_bufhead;
* int async_daemon_count;
*/
int
coda_strategy(void *v)
{
/* true args */
struct vop_strategy_args *ap = v;
struct buf *bp __attribute__((unused)) = ap->a_bp;
struct lwp *l __attribute__((unused)) = curlwp;
/* upcall decl */
/* locals */
myprintf(("coda_strategy called! "));
return(EINVAL);
}
int
coda_reclaim(void *v)
{
/* true args */
struct vop_reclaim_args *ap = v;
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
/* upcall decl */
/* locals */
/*
* Forced unmount/flush will let vnodes with non zero use be destroyed!
*/
ENTRY;
if (IS_UNMOUNTING(cp)) {
#ifdef DEBUG
if (VTOC(vp)->c_ovp) {
if (IS_UNMOUNTING(cp))
printf("coda_reclaim: c_ovp not void: vp %p, cp %p\n", vp, cp);
}
#endif
} else {
#ifdef OLD_DIAGNOSTIC
if (vp->v_usecount != 0)
print("coda_reclaim: pushing active %p\n", vp);
if (VTOC(vp)->c_ovp) {
panic("coda_reclaim: c_ovp not void");
}
#endif
}
cache_purge(vp);
coda_free(VTOC(vp));
SET_VTOC(vp) = NULL;
return (0);
}
int
coda_lock(void *v)
{
/* true args */
struct vop_lock_args *ap = v;
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
/* upcall decl */
/* locals */
ENTRY;
if (coda_lockdebug) {
myprintf(("Attempting lock on %s\n",
coda_f2s(&cp->c_fid)));
}
return (lockmgr(&vp->v_lock, ap->a_flags, &vp->v_interlock));
}
int
coda_unlock(void *v)
{
/* true args */
struct vop_unlock_args *ap = v;
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
/* upcall decl */
/* locals */
ENTRY;
if (coda_lockdebug) {
myprintf(("Attempting unlock on %s\n",
coda_f2s(&cp->c_fid)));
}
return (lockmgr(&vp->v_lock, ap->a_flags | LK_RELEASE, &vp->v_interlock));
}
int
coda_islocked(void *v)
{
/* true args */
struct vop_islocked_args *ap = v;
ENTRY;
return (lockstatus(&ap->a_vp->v_lock));
}
/* How one looks up a vnode given a device/inode pair: */
int
coda_grab_vnode(dev_t dev, ino_t ino, struct vnode **vpp)
{
/* This is like VFS_VGET() or igetinode()! */
int error;
struct mount *mp;
if (!(mp = devtomp(dev))) {
myprintf(("coda_grab_vnode: devtomp(%d) returns NULL\n", dev));
return(ENXIO);
}
/* XXX - ensure that nonzero-return means failure */
error = VFS_VGET(mp, ino, vpp);
if (error) {
myprintf(("coda_grab_vnode: iget/vget(%d, %llu) returns %p, err %d\n",
dev, (unsigned long long)ino, *vpp, error));
return(ENOENT);
}
return(0);
}
void
print_vattr(struct vattr *attr)
{
const char *typestr;
switch (attr->va_type) {
case VNON:
typestr = "VNON";
break;
case VREG:
typestr = "VREG";
break;
case VDIR:
typestr = "VDIR";
break;
case VBLK:
typestr = "VBLK";
break;
case VCHR:
typestr = "VCHR";
break;
case VLNK:
typestr = "VLNK";
break;
case VSOCK:
typestr = "VSCK";
break;
case VFIFO:
typestr = "VFFO";
break;
case VBAD:
typestr = "VBAD";
break;
default:
typestr = "????";
break;
}
myprintf(("attr: type %s mode %d uid %d gid %d fsid %d rdev %d\n",
typestr, (int)attr->va_mode, (int)attr->va_uid,
(int)attr->va_gid, (int)attr->va_fsid, (int)attr->va_rdev));
myprintf((" fileid %d nlink %d size %d blocksize %d bytes %d\n",
(int)attr->va_fileid, (int)attr->va_nlink,
(int)attr->va_size,
(int)attr->va_blocksize,(int)attr->va_bytes));
myprintf((" gen %ld flags %ld vaflags %d\n",
attr->va_gen, attr->va_flags, attr->va_vaflags));
myprintf((" atime sec %d nsec %d\n",
(int)attr->va_atime.tv_sec, (int)attr->va_atime.tv_nsec));
myprintf((" mtime sec %d nsec %d\n",
(int)attr->va_mtime.tv_sec, (int)attr->va_mtime.tv_nsec));
myprintf((" ctime sec %d nsec %d\n",
(int)attr->va_ctime.tv_sec, (int)attr->va_ctime.tv_nsec));
}
/* How to print a ucred */
void
print_cred(kauth_cred_t cred)
{
uint16_t ngroups;
int i;
myprintf(("ref %d\tuid %d\n", kauth_cred_getrefcnt(cred),
kauth_cred_geteuid(cred)));
ngroups = kauth_cred_ngroups(cred);
for (i=0; i < ngroups; i++)
myprintf(("\tgroup %d: (%d)\n", i, kauth_cred_group(cred, i)));
myprintf(("\n"));
}
/*
* Return a vnode for the given fid.
* If no cnode exists for this fid create one and put it
* in a table hashed by coda_f2i(). If the cnode for
* this fid is already in the table return it (ref count is
* incremented by coda_find. The cnode will be flushed from the
* table when coda_inactive calls coda_unsave.
*/
struct cnode *
make_coda_node(CodaFid *fid, struct mount *vfsp, short type)
{
struct cnode *cp;
int err;
if ((cp = coda_find(fid)) == NULL) {
struct vnode *vp;
cp = coda_alloc();
cp->c_fid = *fid;
err = getnewvnode(VT_CODA, vfsp, coda_vnodeop_p, &vp);
if (err) {
panic("coda: getnewvnode returned error %d", err);
}
vp->v_data = cp;
vp->v_type = type;
cp->c_vnode = vp;
coda_save(cp);
} else {
vref(CTOV(cp));
}
return cp;
}
int
coda_getpages(void *v)
{
struct vop_getpages_args /* {
struct vnode *a_vp;
voff_t a_offset;
struct vm_page **a_m;
int *a_count;
int a_centeridx;
vm_prot_t a_access_type;
int a_advice;
int a_flags;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
struct lwp *l = curlwp;
kauth_cred_t cred = l->l_cred;
int error;
/* Check for control object. */
if (IS_CTL_VP(vp)) {
return(EINVAL);
}
error = VOP_OPEN(vp, FREAD, cred, l);
if (error) {
return error;
}
ap->a_vp = cp->c_ovp;
error = VOCALL(ap->a_vp->v_op, VOFFSET(vop_getpages), ap);
(void) VOP_CLOSE(vp, FREAD, cred, l);
return error;
}
int
coda_putpages(void *v)
{
struct vop_putpages_args /* {
struct vnode *a_vp;
voff_t a_offlo;
voff_t a_offhi;
int a_flags;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
simple_unlock(&vp->v_interlock);
/* Check for control object. */
if (IS_CTL_VP(vp)) {
return(EINVAL);
}
/*
* XXX
* we'd like to do something useful here for msync(),
* but that turns out to be hard.
*/
return 0;
}
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